Typically you want to set your rest at center shot with launcher fully up, then set nocking point on string sqaure or slightly high depending on your bow.
That is what Ive done and it shoots fine. However, I was tinkering with the press and noticed at full draw the nick was 1/8" low.
Are you squaring off the riser somehow at full draw to determine your 1/8" low ?? Arrow flight rules so if your getting good tears through paper and good bare shaft i wouldn't worry about it at all...